KR20040077455A - Spacer paper for glass plate - Google Patents

Abstract

PURPOSE: Paper of a glass-like sheet is characterized by using non-woven fabric manufactured out of cellulose, not using a binder in forming the non-woven fabric, pressurizing the non-woven fabric with a flat roller, increasing flatness of a surface of the non-woven fabric to increase adhesion between the non-woven fabric and the glass-like sheet and preventing dust from generating, preventing paper trace for transporting or storing effectively. CONSTITUTION: Paper of a glass-like sheet comprises non-woven fabric manufactured out of cellulose. The non-woven fabric contains under 0.1wt.% of hot water solubles. The non-woven fabric is pressurized by a flat roller and is super-calendered. A surface roughness of the non-woven fabric is under 1.5μm on KES-FB-4S surface tester.

Description

Lamination of glass plates {SPACER PAPER FOR GLASS PLATE}

TECHNICAL FIELD The present invention relates to a paper sandwiched between glass plate materials during transport and storage of a glass plate material, and more particularly, to a paper sheet which reduces contamination on the glass surface by the paper itself and suppresses generation of dust.

Usually, at the time of transport and storage of glass plate materials, such as a glass plate, the paper was sandwiched between glass plate materials, and the convenience of handling was aimed at. In conventional paper, especially paper recycled old paper, the water (water in the air) on the glass surface reacts with the alkali component in the glass during transport and storage, resulting in burning of the glass. In addition, the ink contained in the old paper and the resin powder derived from the old paper itself transferred to the glass plate material, causing stains called paper traces (paper marks) on the glass plate material surface.

In order to prevent the burning and paper traces seen in the use of conventional paper, the paper in which the slit holes are dispersed and arranged (see Patent Document 1, for example), and the paper in which zeolite is blended in the papermaking process (for example, (See Patent Document 2), a paper coated with a water-soluble resin on the surface (see Patent Document 3, for example), and a paper with adjusted hot water content (see Patent Document 4, for example). In order to improve various physical properties, such as the contact area, the improvement is repeated and used.

By the way, in the glass plate material used as a board | substrate of flat panel displays (FPD) represented by a liquid crystal display (LCD), a plasma display panel (PDP), an organic electroluminescent display, etc., the cleanliness of the surface became much higher. However, even when the above various kinds of paper are used, it is difficult to suppress contamination of the glass surface to the required level. For this reason, as a present state, it is not used at the time of the transportation and storage of the "glass substrate" supplied for a display processor, but stays only in the "glass original" which coats a thin film and becomes a glass substrate.

Then, at the time of transport and storage of the glass substrate for display processors of a present state, the method of transporting and storing a glass-like board | plate material with a resin packaging auxiliary mechanism (spacer) (for example, refer patent document 5) is widely used. It is used. According to this method, adhesion of glass-like board | plate materials can be prevented and it is effective about the contamination of the glass-like board material surface. However, the space generated between the glass plates by the packaging aid is wasted, and only a few glass plates can be transported and stored at a time, resulting in an increase in the cost of logistics and storage.

[Patent Document 1] Japanese Patent Application Laid-Open No. 5-208841

[Patent Document 2] Japanese Patent Application Laid-Open No. 7-41034

[Patent Document 3] Japanese Patent Application Laid-Open No. 9-17O198

[Patent Document 4] Japanese Laid-Open Patent Publication No. 2003-41498

[Patent Document 5] Japanese Patent Application Laid-Open No. 2000-142873

This invention is made | formed in view of the said point, and it provides the paper of the clean glass-like board | plate material provided with electrostatic adhesiveness in addition to the prevention of a paper trace, reducing transportation and storage cost, without resorting to a packaging aid.

1 is a cross-sectional view of the release fiber according to one embodiment of the present invention.

2 is a partially enlarged view of a nonwoven fabric according to an embodiment of the present invention.

3 is a schematic cross-sectional view showing an example of a suction device used in the dustproof treatment.

[Description of the code]

1O release fiber

11 cellulose

12 HMCX

13 NaCX

20 nonwovens

21 fusion

22 Play Cellulose

30 suction device

31 suction

32 Pressurization

33 Ultrasonic Generator

That is, the invention of claim 1 is a nonwoven fabric made of cellulose, and the content of the hot water content in the nonwoven fabric is less than 0.1% by weight.

Invention of Claim 2 relates to the lamination of the glass-like board | plate material of Claim 1 in which the said nonwoven fabric is formed without using a binder.

Invention of Claim 3 relates to the lamination of the glass-like board | plate material of Claim 1 or 2 in which the pressurization process with a flat roller is given to the said nonwoven fabric.

The invention of claim 4 relates to the lamination of the glass-like plate material according to any one of claims 1 to 3 in which the super calender treatment is performed on the nonwoven fabric.

The surface roughness of the said nonwoven fabric is related with the lamination | stacking of the glass-like board | plate material of any one of Claims 1-4 which is 1.5 micrometers or less in the measurement by the KES-FB-4S surface tester.

(The best mode for carrying out the invention)

Hereinafter, the present invention will be described with reference to the accompanying drawings. 1 is a cross-sectional view of a release fiber according to an embodiment of the present invention, FIG. 2 is a partially enlarged view of a nonwoven fabric, and FIG. 3 is a schematic cross-sectional view showing an example of a suction device used for a dustproof treatment.

The laminated paper of the glass-like board | plate material of this invention is a nonwoven fabric which uses cellulose as a component and suppressed content of the hot water content (hot water soluble component) below 0.1 weight% per unit nonwoven fabric especially. In addition, as the laminated glass material of the present invention, the constituent material made of cellulose is formed as a nonwoven fabric without using a binder (adhesive), and on the surface of the nonwoven fabric as described later, it is appropriately dustproofed and super calender. The treatment is to be carried out.

Cellulose in the present invention is cellulose (so-called regenerated cellulose) obtained by a known cellulose regeneration method such as viscose method or copper ammonia method from pulp adjusted by alkali dissolution or the like in cotton or wood chips. Fibrous rayon (Viscose method) and cupra (copper ammonia method) correspond to the regenerated cellulose. Since the above-mentioned regenerated cellulose such as rayon is used as a constituent material of the nonwoven fabric of the present invention, unlike the paper made from paper or wood pulp produced by regeneration of old paper, that is, paper made of paper, uniformity of the components is achieved. do.

In the case of forming the laminated glass material from the fibrous rayon and cupra as a woven fabric, generally, in the loom, the lubricant must be appropriately infiltrated into the rayon and cupra fiber, and impurities such as oil are contained in the final woven product. Remaining. Therefore, assuming that the glass substrate for flat panel display (FPD) is used for transportation or the like, contamination to the surface of the glass substrate due to residual oil is feared. Moreover, when using the woven fabric which consists of a conventional rayon and cupra fiber as lamination of a glass-like board | plate material, the removal of oil is needed separately from the woven fabric itself, a work process becomes complicated, and cost increase cannot be denied. Therefore, the lamination of the glass-like plate material is very suitable to form a nonwoven fabric using cellulose as a constituent material as defined in claim 1.

In processing into a nonwoven fabric, there is also a method of adding various known binders to fibrous cellulose. However, for the purpose of restraining the contamination of the surface of the glass-like plate material, which is the object of the present invention, the nonwoven fabric formed without using a binder, as defined in claim 2, should be used. As a manufacturing method which does not use a binder, although the needle punching method etc. which entangle the fibers by scraping a fiber by the long needle with rayon and cupra which were previously radiated are illustrated, the lubricating oil must be appropriately attached to a long needle, and the use of the said loom is used. Not preferred for the same reason.

From the above viewpoint, as a manufacturing method which does not use a binder, manufacturing methods, such as the span lace method which entangles adjacent fibers by high pressure water, etc. of the fiber manufactured previously, such as rayon and cupra, are used, and the said regenerated cellulose is used as a component material. One nonwoven is produced. Moreover, in rayon, the manufacturing method which fixes a fiber stock solution (viscose) from spinning, heat-compresses a constituent fiber by thermocompression, and performs it continuously until manufacture of a nonwoven fabric, and in cupra, the active fiber of a non-regenerated state (Blau Faden ( The manufacturing method which performs continuously by adhesion | attachment by a hydrogen bond using surface water expandability of the green building)), and the manufacture of the nonwoven fabric by the entanglement by high pressure water flow is illustrated.

The heat-soluble water content of a claim is the ratio of the total weight to the nonwoven fabric of the component eluted in hot water from the nonwoven fabric of this invention. As described in the background art described above, during transport and storage of the glass plate, moisture in the air is absorbed into the paper, so that contamination of the glass surface has been a problem due to elution of the components in the paper. Therefore, the hot water soluble component (hot water soluble component) was defined as an index for testing the elution of the component in the paper.

Although the heat-soluble content in this invention is mentioned in the below-mentioned Example, "TAPPI T207 om-81, the water-soluble content of wood and pulp, 6. 2, hot water solubility made by the United States of America Paper and Pulp Technology Association (TAPPI). Minute ". As described in Japanese Laid-Open Patent Publication No. 2003-41498, which is disclosed in the background art, it is extremely difficult to make the hot water content less than 0.1% by weight in the lamination of a glass plate made of a conventional method for producing old paper. have. On the other hand, as this invention makes clear from a Example mentioned later, since a cellulose is a component and hardly contains other impurities, a hot water content can be made into less than 0.1 weight%, and a glass-like board | plate material (especially glass It is effective for preventing the paper trace on the substrate) surface.

In obtaining the nonwoven fabric which consists of said regenerated cellulose, the nonwoven fabric manufactured based on the viscose method is demonstrated.

Cellulose (11) as shown in the cross-sectional view of FIG. ), Hydroxymethyl cellulose sulfate (hereinafter referred to as HMCX) (12), sodium cellulose sulfate (hereinafter referred to as NaCX) (13), the release fiber 10 consisting of three layers can be obtained. have.

For the three components of the release fiber 10, its general chemical structure is shown in Table 1 below.

The release fiber 10 composed of the above three layers is appropriately cut, dispersed and agitated to become a substantially planar body, and HMCX is thermally fluidized by thermocompression when embossing is performed using an embossing roller in the presence of water. Weld together surrounding discharge fiber. In addition, when heating proceeds, HMCX will thermally decompose and change to cellulose, and solidify by forming the fusion | fusing part 21 shown in the partial enlarged view of FIG. Thereafter, shrinkage is performed under a dilute acid such as an appropriate temperature and pH, and the HMCX and NaCX are changed to cellulose. Subsequently, by bleaching, washing with water, drying and the like, the nonwoven fabric 20 formed of cellulose as a constituent material without using a binder can be obtained. Reference numeral 22 denotes regenerated cellulose whose inside is changed to cellulose.

As described above, the lamination of the glass plate of the present invention includes a cellulose derivative in its manufacturing process, but since it is finally changed to cellulose, cellulose can be said to be a constituent material.

At the time of shaping the said nonwoven fabric, especially at the time of the said embossing process, it is preferable to pressurize with a flat roller further as prescribed by Claim 3. When the flat roller is used in this way, the release fibers that are thermocompressed by embossing are smoothed by further pressurization of the flat roller, and at the same time, the fluffing of the release fibers of short fiber length is suppressed. Therefore, the pressurization process by a flat roller acts effectively as a dustproof process. In addition, the shape, size, pressurization amount by a flat roller, etc. of an embossing are set suitably.

In addition, the nonwoven fabric obtained by completely changing the internal component of the discharge fiber to cellulose and undergoing bleaching, washing with water, drying, or the like can be used as a suction device (as shown in a schematic cross-sectional view of FIG. By using 30), the dust-proofing process which sucks lint group on the surface of a nonwoven fabric may be performed. The suction device 30, together with the ultrasonic wave irradiated from the ultrasonic generator 33, the air injected from the pressing portion 32 with respect to the surface of the nonwoven fabric 20 transmitted by the transfer roller 45, the surface of the nonwoven fabric By spraying while shaking, the dust generating factor of the nonwoven fabric 20 is floated, sucked into the suction part 31, and exhausted from the exhaust port 35 to the outside. Although FIG. 3 is an example which attracts a dust generation factor in the one surface side of the nonwoven fabric 20, it is preferable to suck a dust generation factor with respect to both surfaces of a nonwoven fabric. Reference numeral 34 denotes a suction port and 40 denotes an electrostatic removing unit.

As a use state of the paper generally used for a glass-like board | plate material, for example, at least one of the paper and glass-like board | plate material as disclosed in Unexamined-Japanese-Patent No. 49-13865 is made to charge a predetermined voltage, and the static electricity produced at that time is used, It is often used by polymerizing both. In other words, by using static electricity, the paper and the glass plate are brought into close contact with each other to achieve convenience in the work of inserting the paper into the glass plate.

However, the surface of the nonwoven fabric is rough even in comparison with the conventional paper. Therefore, the contact area between the glass plate and the nonwoven fabric is smaller than that of the conventional paper, and it cannot be said that the effect of improving the adhesiveness by the electrostatic charging is sufficiently obtained. Therefore, it can be said that it is preferable to raise the smoothness of a nonwoven fabric as much as possible about the adhesiveness of the nonwoven fabric and glass-like board | plate material at the time of static electricity charge.

Therefore, in order to improve the smoothness of the surface with respect to the nonwoven fabric formed as mentioned above and performing dustproof processing at any time, as superimposed by Claim 4, the supercalendar process is performed. The super calender treatment (or abbreviated as super calender treatment) is usually performed by passing the nonwoven fabric of the present invention while repeatedly stacking a multi-stage composed of a total of 5 to 20 stages alternately with a metal roller and a non-metal elastic roll. It is the process of pressurizing 1900-2600 N / cm (up to about 3500 N / cm at maximum) by linear pressure. By this supercalendar process, the nonwoven fabric is subjected to high pressure to make the thickness thin, and at the same time, the dustproofness of the surface of the nonwoven fabric is increased, and the smoothness is also increased. In addition, processing conditions, such as pressure (linear pressure), temperature, water content of a nonwoven fabric, pressurization time, etc. in a super calender process are set suitably.

Here, the smoothness of the nonwoven fabric of the present invention is determined as the surface roughness in the nonwoven fabric (lamination of the glass plate) as defined in claim 5. It is very suitable that the surface roughness is quantified by a KES-FB-4S surface tester manufactured by Kart Tech Co., Ltd., and regulated to 1.5 µm or less, and even 1.2 µm or less. As is clear from the examples described later, better samples are obtained in electrostatic adhesion as the samples subjected to the super calender treatment in order to improve smoothness. Considering the above, the relationship between surface roughness and electrostatic adhesion is inferred, and suppression of surface roughness becomes an index of improvement of electrostatic adhesion.

In addition, although the lamination of the glass-like board | plate material in this invention was mentioned above as mentioned above, the embossing process using the roller for embossing is abbreviate | omitted at the time of manufacture of the said paper in the welding of release fiber, and pressurized by a flat roller In some cases, only processing is required. In addition, at the time of manufacture of the paper which consists of a nonwoven fabric, the pressurization process and super calender process by a flat roller are inserted in the process suitably in consideration of a manufacturing facility, a production cost, etc., and are not necessarily limited to said process. .

(Example)

As described above, the inventors made a nonwoven fabric formed without using a cellulose-based binder as a lamination of the glass-like plate material of the present invention, and produced a non-woven fabric (Futamura Kagaku Kogyo Co., Ltd.) as described above. Agent: Tyco TCF) was created as a lamination of the glass plate of an Example. About the nonwoven fabric of the said Example, pressurization by the flat roller at the time of embossing was performed as a dustproof process.

Moreover, the paper actually used as the paper of the glass original plate for flat panel display substrates was compared with the paper of the Example as a comparative example. In the paper of the comparative example, paper (made by N company: NPD) made of acidic paper made from pulp of the conventional method was used as Comparative Example 1, and paper (made by N company: NDP) made of neutral paper was made as Comparative Example 2, and recycled from old paper. Used paper (manufactured by T Company: ATP) was used as Comparative Example 3.

[Measurement of hot water content]

The papers of Examples and Comparative Examples 1 to 3 were evaluated based on the above-mentioned "TAPPI T207 om-81, water solubles of wood and pulp, 6. 2, hot water solubles". Specifically, 5 g of each was collected as a sample from the papers of Examples and Comparative Examples 1 to 3, 250 g of distilled water was added thereto, and the mixture was boiled for 30 minutes. The extract was separated by filtration, 250 g of distilled water was further added, and the mixture was boiled for 30 minutes. This operation was performed three times, and three extracts were collected.

The extract was concentrated in an evaporating dish, dried, and weighed, and the weight ratio of each sample of the dried product was determined as hot water content (% by weight). The results are shown in Table 2.

As understood from the results of Table 2, the lamination of the glass-like plate material of the examples is, compared with the laminations of Comparative Examples 1 to 3, for example, since the binder is not used when the pulp is evaporated, the amount of hot water is available. There is a small amount of this, and it can be inferred that it is effective for the prevention of the paper trace on a glass surface.

[Evaluation of Impact on Glass Surface]

The laminated sheets of Examples and Comparative Examples 1 to 3 cut into pieces were arranged in parallel, and the laminated sheets were sandwiched between two sheets of TFT-LCD module glass. In addition, the glass was sandwiched by foamed plastic so that pressure was applied uniformly and fixed with a rubber band. Such a single piece of plate glass and paper was exposed for up to 318 hours under conditions of a temperature of 60 ° C. and a relative humidity of 95%.

With respect to the integrated body of the plate glass and the paper, water vapor is struck on the plate glass surface, and after being cloudy, a single pore urethane sponge is used to strongly apply a uniform pressure to the contact surface of each paper. Rubbed. After drying of the plate glass surface, steam was again fired and the sensory evaluation of the peeling state of the paper trace (paper mark) of the paper adhesion surface was visually evaluated in four steps. In this evaluation, the paper of the paper contact | adherence surface wiped | polished best in the state which removed the paper trace was evaluated as "1", and the paper of the paper contact surface which was not wiped up was evaluated to "4". The evaluation value for every elapsed time was totaled, and four stages of comprehensive evaluation were performed. By merging, in order to correctly evaluate the paper trace, it was confirmed that the plate glass which did not adhere the paper was not burnt in the exposed part. Table 3 below shows the passage of the exposure time and the contamination of the plate glass surface.

As understood from the results in Table 3 above, the paper of the examples exhibits good properties even when compared with the paper of any comparative example, and it can be said that the quality is stable.

Based on these results, a clear relationship is established between the amount of the hot water content and the contamination of the plate glass surface, and is formed without using a binder, in particular the lamination of the embodiment of the present invention, that is, cellulose. One nonwoven fabric, in particular, suggests that it is very suitable as a paper lamination for glass substrates during transport or storage of glass substrates requiring high cleanliness.

[Preparation of Nonwovens]

The inventors convinced of the suitability of the nonwoven fabric from the above-mentioned findings are the nonwoven fabrics (Ftamura Kagaku Kogyo Co., Ltd.) which differ in the weight per unit area (g / m ² ) and the surface roughness (micrometer) obtained by the viscose method as mentioned above. 3) Taiko TCF series) were manufactured. The three types of nonwoven fabrics were identified as Sample 1-1, Sample 1-2, and Sample 1-3 in the examples below. In addition, only the nonwoven fabric of Sample 1-3 was pressurized by the flat roller at the time of embossing.

Moreover, in order to control the smoothness of the surface of a nonwoven fabric, the inventors performed super calender process about the nonwoven fabric of said sample 1-1, the sample 1-2, and the sample 1-3, respectively. In the following Examples, the nonwoven fabric subjected to the super calender treatment to Sample 1-1 was used as Sample 2-1, and the same nonwoven fabric subjected to the same treatment to Sample 1-2 was similar to Sample 2-2 and Sample 1-3. The treated nonwoven fabric was identified as Sample 2-3. The conditions of this super calendering process are 14 steps, 13 nips, linear pressure: 1960 N / cm, temperature: 80 degreeC, and processing speed: 60 m / min.

[Measurement of Surface Roughness]

About the nonwoven fabric of each said sample, the surface roughness was measured using the KES-FB-4S surface tester by Kart Tech Co., Ltd., respectively. The measurement conditions are static load: 98 mN, tension: 196 mN / cm, contact contact length: 5 mm, tensile speed: 0.1 cm / sec, and tensile distance: 2 cm. At the time of measuring each sample, length and width were measured 5 times, respectively, the average value in the vertical direction and the average value in the horizontal direction were computed, and the larger one was called the surface roughness of the sample.

[Measurement of Electrostatic Adhesion]

In a room kept at a room temperature of 20 ° C. and a relative humidity of 65%, the nonwoven fabric of each of the samples cut in the same manner as the A4 plate was polymerized on the plate glass for TFT-LCD module cut out by the A4 plate (about 210 mm × 297 mm). On these nonwoven fabrics, an electrostatic charging device (electrostatic fine collector JPK-3: manufactured by Kasuga Denki Co., Ltd.) was used to charge a static electricity of -20 kV. In this case, the charging electrode sphere of the electrostatic charging device was charged to the entire nonwoven fabric while maintaining the position of 5 cm above the nonwoven fabric of each sample.

With respect to the integrated body of the plate glass sufficiently charged and the nonwoven fabric of each sample, the top and bottom were completely reversed, and the time until the nonwoven fabric of the sample was completely peeled off from the plate glass was measured. However, the measurement of time was made into 20 second.

For the nonwoven fabrics of Sample 1-1, Sample 1-2, Sample 1-3, Sample 2-1, Sample 2-2, and Sample 2-3, and Comparative Example 2 (the neutral paper), their physical properties and measurement results were described. Table 4 shows.

As understood from Table 4, all of the samples 2-1, 2-2, and 2-3, which were subjected to super calender treatment compared to Samples 1-1, 1-2, and 1-3, were numerical values of surface roughness. Decreased. In connection with this, it turns out that the electrostatic adhesiveness (duration of the state stuck together) of the sample also improved significantly. Therefore, it can be said that the smoothness of the surface of a nonwoven fabric is effective at the time of electrostatic adhesiveness improvement. Moreover, the comparison of the sample 2-1, the sample 2-2, the sample 2-3, and the comparative example 2 showed the electrostatic adhesiveness equivalent to the conventional paper (comparative example 2: neutral paper). Therefore, the inventors have confirmed that when the nonwoven fabric subjected to the super calender treatment is used, the adhesion with the glass plate material using static electricity is enabled, and the convenience in the work of inserting the paper into the glass plate material is confirmed.

[Measurement of Dust Generation]

In a Class 10000 clean room, a simple type hood made of vinyl chloride resin was assembled, which can be opened only on one side of the sides consisting of 700 mm long by 500 mm wide by 500 mm deep. A hole was drilled in the center of the ceiling of the simple hood, and the air inlet and the particulate counter (child / double: made by HIAC / ROICO) were installed so that about 10 cm below the same simple hood.

The nonwoven fabric of the said sample 1-1, the sample 1-2, the sample 1-3, the sample 2-1, the sample 2-2, and the sample 2-3 cut | disconnected by the A4 board (about 210mm * 297mm) beforehand respectively Gold was cut out to the size of 1/8 of the dimension. Subsequently, the simple hood is opened by about 100 mm, and the nonwoven fabric of each sample notched in the center of the simple hood is subjected to a speed of 5 seconds per time, using a pair of sewing scissors for a total of one sample. I cut it eight times.

Among the small particles (dust) blown out from the sample in the clean room by the above cutting, in particular, small particles of 0.3 µm or more were measured by the above air / fine particle counter. The measurement results are shown in Table 5. In addition, the measurement number of elementary particles was calculated | required as the number per unit cubic feet, and the conversion number per unit cubic meters was also attached as a reference.

As can be understood from Table 5, the sample 2-1, sample 2-2, and sample 2-3 in which the super calender treatment was performed compared to sample 1-1, sample 1-2, and sample 1-3 were all measured by the number of elementary particles. It was reduced by about half. Therefore, it turns out that a super calender process is also effective as a dustproof process of a nonwoven fabric.

As a result, it is conventionally used as a "glass original" which coats a thin film and becomes a glass substrate, but the use of the laminated paper can be extended to the time of transport and storage of the "glass substrate" supplied for display processors. Therefore, even when transporting and storing a glass substrate, improvement of the amount of distribution and storage amount per one is expected, without resorting to the packaging aid (spacer).

According to the lamination of the glass plate according to the invention of claim 1, since it is a nonwoven fabric made of cellulose as a constituent material, it contains components other than cellulose such as those found in paper that has been impregnated from conventional pulp or paper coated with resin powder. There is no work. As a result, it becomes possible to make content of a hot water content less than 0.1 weight%, and it can exert an extremely effective in suppressing the stain (paper trace) which arises on the glass surface at the time of transport and storage.

According to the lamination of the glass-like sheet material according to the invention of claim 2, since no binder is used in the formation of the nonwoven fabric, the lamination is formed almost exclusively of cellulose (regenerated cellulose), which is a constituent material, and the inclusions shown in the conventional laminations. The transfer to the glass surface such as impurities can be eliminated. As a result, a further effect can be exerted on suppression of the unevenness (paper trace) of the glass surface, so that the glass-like plate material can be transported and stored in an extremely clean state.

According to the lamination of the glass-like plate material according to the invention of claim 3, since the pressurizing treatment with a flat roller is performed on the nonwoven fabric, it is possible to suppress the generation of dust when using the lamination made of the nonwoven fabric.

According to the lamination of the glass-like plate material according to the invention of claim 4, since the super calender treatment is performed on the nonwoven fabric, dust generation when using the lamination made of the nonwoven fabric can be further suppressed.

In addition, since the smoothness of the surface of the nonwoven fabric is improved, the adhesiveness between the paper (nonwoven fabric) using static electricity and the glass plate is improved, and the convenience in the work of inserting the paper into the glass plate is improved.

According to the lamination of the glass plate according to the invention of claim 5, since the surface roughness is 1.5 µm or less, good electrostatic adhesion with the glass plate can be obtained.

Claims (5)

A nonwoven fabric comprising cellulose as a constituent material, wherein the content of hot water in the nonwoven fabric is less than 0.1% by weight. The paper sheet of claim 1, wherein the nonwoven fabric is formed without using a binder. The paper processing of the glass-like board | plate material of Claim 1 or 2 characterized by the pressurization process by a flat roller being given to the said nonwoven fabric. The paper lamination of the glass-like board | plate material of any one of Claims 1-3 characterized by the super calendering process being given to the said nonwoven fabric. The surface roughness of the said nonwoven fabric is 1.5 micrometers or less in the measurement by the KES-FB-4S surface test machine, The laminated paper of any one of Claims 1-4 characterized by the above-mentioned.